<?xml version="1.0" encoding="utf-8"?>
<!--
Taxonomy based on XBRL standard Version 2.1.
Created by UBmatrix Taxonomy Designer 3.0.3.2414 (2009-04-10 21:01).  
Contact www.ubmatrix.com
Copyright (c) 2002-2009 UBmatrix inc., All Rights Reserved
Produced on 2009-04-30 13:52:24
-->
<schema
  xmlns="http://www.w3.org/2001/XMLSchema"
  xmlns:xbrli="http://www.xbrl.org/2003/instance"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:essence-alias="http://www.example.com/essence-alias"
  targetNamespace="http://www.example.com/essence-alias"
  elementFormDefault="qualified"
  attributeFormDefault="unqualified">
  <annotation>
    <appinfo>
      <link:roleType
        roleURI="http://www.example.com/new/tuple-tuple"
        id="tuple-tuple">
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>

      <link:linkbaseRef xlink:type="simple"
        xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef"
        xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"
        xlink:href="392-Essence-Alias-definition.xml"
        xlink:title="Definition Links, all" />
    </appinfo>
  </annotation>
  <import
    namespace="http://www.xbrl.org/2003/instance"
    schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <element
    id="essence-alias_Item"
    name="Item"
    type="xbrli:stringItemType"
    substitutionGroup="xbrli:item"
    xbrli:periodType="instant"
    nillable="true" />
  <element
    id="essence-alias_TupleA"
    name="TupleA"
    substitutionGroup="xbrli:tuple"
    nillable="true">
    <complexType>
      <complexContent>
        <restriction
          base="anyType">
          <sequence />
          <attribute
            name="id"
            type="ID" />
        </restriction>
      </complexContent>
    </complexType>
  </element>
  <element
    id="essence-alias_TupleB"
    name="TupleB"
    substitutionGroup="xbrli:tuple"
    nillable="true">
    <complexType>
      <complexContent>
        <restriction
          base="anyType">
          <sequence />
          <attribute
            name="id"
            type="ID" />
        </restriction>
      </complexContent>
    </complexType>
  </element>
</schema>